Subwoofer



FIG. 1 is a front perspective view of the subwoofer;

FIGS. 2 and 3 is a front-on view and a back view of the subwoofer;

FIGS. 4 and 5 show alternate side views of the subwoofer;

FIG. 6 shows a top view respectively of the subwoofer; and,

FIG. 7 shows a bottom view of the subwoofer.

The broken lines shown are included for the purpose of illustrating the unclaimed portions of the article and form no part of the claim. 

The ornamental design for a subwoofer, as shown and described. 